SMI反演在准噶尔盆地陆梁地区南部储层预测中的应用

Application of SMI in Reservoir Prediction on the South Aera of Junggar Basin

地震波形指示反演技术充分利用地震波形的横向变化信息,不要求井位均匀分布,具有更强的确定性,而且高频结构受波形变化控制,更好地体现了沉积环境的约束;在提高垂向分辨率的同时,更好地保证了横向预测结果的可靠性。本文以地震波形指示反演的基本理论为依据,以储层岩石物理特征分析结果为基础,优选出可以在本区更好地区分砂泥岩的自然伽玛曲线(GR)作为约束条件,对准噶尔盆地陆梁地区南部侏罗系三工河组二段地层进行了储层反演预测。经综合对比分析,砂岩厚度预测结果与已钻井吻合率达到80%以上,纵向分辨率高,横向变化更符合沉积规律。

Seismic motion inversion technology make full use of the transverse variation information seismic waveform.Uniform well placement is not necessary.Seismic motion inversion is greater determinate.Moreover,the high frequency structure is controlled by seismic waveform variation.It better reflects the constraints of sedimentary environment,while improving the vertical resolution.The reliability of the transverse predicted results is better guaranteed.The paper is based on the basic theory of seismic motion inversion.Based on analysis results of reservoir rock physical characteristics.The sand and mudstone can be better distinguished by GR curve in the area.So,the GR curve was used to inversion in Jurassic Sangonghe layer.By comprehensive analysis,Predicted sandstone thickness is goodness of fit finished well to 80 percent.Results of Seismic motion inversion is pinpoint,Vertical resolution is better high,horizontal result is better conform to deposition low.